Accession Number : AD0719759

Title :   An Attempt to Construct an Analytical Model of the Start of Compressible Transition.

Descriptive Note : Final rept. Sep 69-Sep 70,

Corporate Author : AERONAUTICAL RESEARCH ASSOCIATES OF PRINCETON INC N J

Personal Author(s) : Donaldson,Coleman duP. ; Sullivan,Roger D. ; Yates,John E.

Report Date : JAN 1971

Pagination or Media Count : 80

Abstract : The results of the first step in an attempt to develop a model of compressible transition are reported. The basis of the method goes back to the equations used by Reynolds many years ago to study incompressible viscous instabilities and turbulence. In the work reported here, a simplified linearized version of a set of equations which has been proposed to study complete transitions and turbulent boundary layers in compressible flow are solved by machine computation in order to evaluate the general character of compressible instability that is given by the model. These results are discussed in the light of results obtained from classical stability calculations. Finally, by coupling the instability calculation to the mean flow equation through the Reynolds stress term, the general character of the run-out of instability (as defined by the simplified equations) to the start of transition is investigated. (Author)

Descriptors :   (*COMPRESSIBLE FLOW, MATHEMATICAL MODELS), (*BOUNDARY LAYER, COMPRESSIBLE FLOW), TURBULENT BOUNDARY LAYER, REYNOLDS NUMBER, INTEGRAL EQUATIONS, EQUATIONS OF MOTION, CORRELATION TECHNIQUES, STABILITY

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE